I have been taking Yas for about a year and a half... but since t...

I have been taking Yas for about a year and a half... but since the start of my last pack, I've noticed that about an hour to hour and a half after I take my pill I start getting heart palpitations. My heart thumps really hard about every other beat. Why would this start now and what could it be? I haven't talked to my doctor about it yet, because I first I thought it may have been my caffeine intake but it still happens right after I take my pill...